matreex 0.44.0

A simple matrix implementation.
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134

use super::super::order::Order;
use super::Layout;
use core::fmt;
use core::marker::PhantomData;
use serde::de::{Deserialize, Deserializer, Error, MapAccess, SeqAccess, Visitor};
use serde::ser::{Serialize, SerializeStruct, Serializer};

const FIELDS: &[&str] = &["major", "minor"];

impl<T, O> Serialize for Layout<T, O>
where
    O: Order,
{
    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
    where
        S: Serializer,
    {
        let mut layout = serializer.serialize_struct("Layout", 2)?;
        layout.serialize_field("major", &self.major)?;
        layout.serialize_field("minor", &self.minor)?;
        layout.end()
    }
}

impl<'de, T, O> Deserialize<'de> for Layout<T, O>
where
    O: Order,
{
    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
    where
        D: Deserializer<'de>,
    {
        deserializer.deserialize_struct("Layout", FIELDS, LayoutVisitor(PhantomData))
    }
}

#[derive(Debug)]
struct LayoutVisitor<T, O>(PhantomData<(T, O)>);

impl<'de, T, O> Visitor<'de> for LayoutVisitor<T, O>
where
    O: Order,
{
    type Value = Layout<T, O>;

    fn expecting(&self, formatter: &mut fmt::Formatter<'_>) -> fmt::Result {
        formatter.write_str("struct Layout")
    }

    fn visit_seq<A>(self, mut seq: A) -> Result<Self::Value, A::Error>
    where
        A: SeqAccess<'de>,
    {
        let major: usize = seq
            .next_element()?
            .ok_or_else(|| Error::invalid_length(0, &self))?;
        let minor: usize = seq
            .next_element()?
            .ok_or_else(|| Error::invalid_length(1, &self))?;

        Layout::new(major, minor)
            .map(|(layout, _)| layout)
            .map_err(A::Error::custom)
    }

    fn visit_map<A>(self, mut map: A) -> Result<Self::Value, A::Error>
    where
        A: MapAccess<'de>,
    {
        let mut major: Option<usize> = None;
        let mut minor: Option<usize> = None;

        while let Some(key) = map.next_key()? {
            match key {
                Field::Major => {
                    if major.is_some() {
                        return Err(Error::duplicate_field("major"));
                    }
                    major = Some(map.next_value()?);
                }
                Field::Minor => {
                    if minor.is_some() {
                        return Err(Error::duplicate_field("minor"));
                    }
                    minor = Some(map.next_value()?);
                }
            }
        }

        let major = major.ok_or_else(|| Error::missing_field("major"))?;
        let minor = minor.ok_or_else(|| Error::missing_field("minor"))?;

        Layout::new(major, minor)
            .map(|(layout, _)| layout)
            .map_err(A::Error::custom)
    }
}

#[derive(Debug)]
enum Field {
    Major,
    Minor,
}

impl<'de> Deserialize<'de> for Field {
    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
    where
        D: Deserializer<'de>,
    {
        deserializer.deserialize_identifier(FieldVisitor)
    }
}

#[derive(Debug)]
struct FieldVisitor;

impl Visitor<'_> for FieldVisitor {
    type Value = Field;

    fn expecting(&self, formatter: &mut fmt::Formatter<'_>) -> fmt::Result {
        formatter.write_str("`major` or `minor`")
    }

    fn visit_str<E>(self, value: &str) -> Result<Self::Value, E>
    where
        E: Error,
    {
        match value {
            "major" => Ok(Self::Value::Major),
            "minor" => Ok(Self::Value::Minor),
            _ => Err(E::unknown_field(value, FIELDS)),
        }
    }
}